This episode guide has been compiled from incomplete video material.
Telly greets the viewer, saying that today he's going to play doctor with Betty Lou (and her dolly) and Nathan -- but each of them thinks they will be the doctor.
The gang finds a bench to set up the Betty Lou Clinic. Each of them pretends to be sick, and Telly gives such a good performance that the others vote for him to be the sick person.
At Betty Lou's instruction, Telly pretends to be sick with "alphabetitis", and Betty Lou and Nathan pretend to operate on him. One by one, the letters are extracted from Telly's head, and he feels better when they're all done -- but Betty Lou still want to keep playing, so he keeps pretending to be sick.
Telly is now sick with "numberitis", so Betty Lou and Nathan extract the numbers 1-40 from his tummy.
Telly is now sick with "Spanish numberitis" in his chest. Betty Lou uses the open mouth cure, which makes the numeros 1-10 come out of his boca. Telly is done being the sick person, so they decide to find someone to take his place.
Ruthie is the new sick person, since she is also good at pretending. Betty Lou pretends that Ruthie is sick with "rhyme-itis", and the doctors extract the words that rhyme with Ruthie's body parts. Afterwards, Ruthie takes the doctors out for ice cream.
Ruthie thinks that she could eat ice cream all day. Betty Lou pretends that Ruthie has "ice cream-itis", and the doctors pretend to operate on her again. Big Bird announces the sponsors.